Adjustable infant highchair



FIG. 1 is a front and right side perspective view of an adjustable infant highchair with a tray showing my new design;

FIG. 2 is a front and right side perspective view of the adjustable infant highchair with the tray removed;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a top view of FIG. 2;

FIG. 5 is a left side view of FIG. 1, wherein the right side view being a mirror image thereof;

FIG. 6 is a front view of FIG. 1;

FIG. 7 is a front view FIG. 2;

FIG. 8 is a back view of FIG. 1; and,

FIG. 9 is a bottom of FIG. 1. 

CLAIM The ornamental design for an adjustable infant highchair, as shown and described. 